Add GitHub Codespaces support for Common Lisp development

.devcontainer/devcontainer.json

@@ -0,0 +1,27 @@
+{
+  "name": "Common Lisp (SBCL)",
+  "image": "mcr.microsoft.com/devcontainers/base:ubuntu",
+  "features": {
+    "ghcr.io/devcontainers/features/common-utils:2": {
+      "installZsh": true,
+      "configureZshAsDefaultShell": true
+    }
+  },
+  "onCreateCommand": "sudo apt-get update && sudo apt-get install -y sbcl curl",
+  "postCreateCommand": ".devcontainer/setup.sh",
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "rheller.alive"
+      ],
+      "settings": {
+        "alive.lsp.startCommand": ["sbcl", "--dynamic-space-size", "2048"],
+        "editor.formatOnSave": false,
+        "files.associations": {
+          "*.lisp": "lisp",
+          "*.asd": "lisp"
+        }
+      }
+    }
+  }
+}

.devcontainer/setup.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+# Post-creation setup script for GitHub Codespaces
+# Installs Quicklisp and required Common Lisp libraries
+
+set -e
+
+QUICKLISP_DIR="$HOME/quicklisp"
+
+# Install Quicklisp if not already present
+if [ ! -d "$QUICKLISP_DIR" ]; then
+    echo "Installing Quicklisp..."
+    tmpdir=$(mktemp -d)
+    curl -o "$tmpdir/quicklisp.lisp" https://beta.quicklisp.org/quicklisp.lisp
+    sbcl --load "$tmpdir/quicklisp.lisp" \
+         --eval '(quicklisp-quickstart:install)' \
+         --eval '(quit)'
+    rm -rf "$tmpdir"
+    echo "Quicklisp installed."
+else
+    echo "Quicklisp already installed, skipping."
+fi
+
+# Load Quicklisp and install required libraries
+# These match the ql:quickload calls in the .lisp source files.
+# Update this list if new libraries are added to the project.
+echo "Installing required Common Lisp libraries..."
+sbcl --load "$QUICKLISP_DIR/setup.lisp" \
+     --eval "(ql:quickload '(:with-user-abort :adopt :str :parse-float :cl-charms :fuzzy-match :cl-csv :cl-ppcre) :silent t)" \
+     --eval '(quit)'
+
+echo "Setup complete. SBCL and Common Lisp libraries are ready."

.gitignore

@@ -0,0 +1,3 @@
+# Build artifacts from lisp/Makefile
+lisp/bin/
+lisp/man/